Well its expands than regulates the air (for co2 at least) and makes your gun more consistant, more effciant, less velocity spikes, and will keep your internals cleaner if your using co2. This is the best reg for co2, and works great with nitro. So if you want maximum performance out of your maker, put a palmer reg on it.

Conclusion:

If you want the best, and your marker to be its best, but the palmer, its well worth it. It makes any gun more consistant, efficant, keeps the internals cleaner, and prevents velocity spikes.